Delhi's Duplicate Image Problem: How the Capital Stacks Up Against Mumbai, Seoul and London

Delhi's land and property registry offices processed more than 400,000 document submissions in the 2024–25 financial year, according to figures published by the Delhi government's Revenue Department. A significant share of those files arrived with duplicate, recycled or mismatched photographs — images attached to the wrong property, reused across multiple applications, or simply copied from earlier filings. The problem is not new. What is new is the pressure to fix it.

The urgency comes from two directions at once. Across Chandni Chowk and the densely packed lanes of Shahdara, residents applying for property mutation certificates have reported delays stretching to four and five months, in part because revenue clerks must manually flag image discrepancies before a file can advance. At the same time, the Delhi Development Authority has been rolling out a digitised record system under its ongoing masterplan implementation work, and duplicated images are creating bottlenecks that slow the entire pipeline.

What Other Cities Have Done

Mumbai moved first in India. The Maharashtra government deployed an automated image-deduplication layer inside the Inspector General of Registration's e-registration portal in late 2023, using perceptual hashing to catch identical or near-identical photographs at the point of upload. The system, built in partnership with the National Informatics Centre, reduced manual re-verification queues at sub-registrar offices in Bandra and Andheri by a reported 30 percent within six months of deployment, according to a Maharashtra government press release issued in March 2024.

Seoul offers a sharper contrast. The Seoul Metropolitan Government integrated reverse-image verification into its Integrated Civil Service portal — known locally as Minwon24 — by 2022. Every photograph submitted for civic ID purposes is checked against a live database before the form can be submitted. The South Korean capital processed roughly 11 million civic document requests in 2023 and flagged fewer than 0.4 percent for image irregularities, according to data published by the Seoul Digital Foundation. London's approach is different again: the HM Land Registry moved to a fully document-scan-based model for property filings in England and Wales, with automated quality checks that reject blurry, duplicated or previously registered images at the server level before a human reviewer ever sees the file.

Delhi's Patchwork Response

Delhi is not standing still. The Delhi e-District portal, managed under the National Informatics Centre's state unit, introduced a basic duplicate-detection flag in early 2025 for a subset of certificates including domicile and caste documents. The system is live at district offices in Dwarka and Rohini. But it does not yet extend to property registration, which remains the largest source of image duplication complaints, and it has no real-time feedback loop for applicants who submit a flagged file.

The Delhi Metro Rail Corporation's Phase 4 expansion has added a parallel complication. Land acquisition paperwork for the 65.1-kilometre new network — covering corridors from Janakpuri West to R.K. Ashram Marg and from Aerocity to Tughlakabad — has generated tens of thousands of additional property files, many drawn from older scanned records where photograph quality and uniqueness were never standardised. Revenue officials in South Delhi district offices have been working through a backlog of such cases since at least January 2026.

The practical gap between Delhi and comparable megacities is not primarily technical. NIC has the capability to deploy perceptual hashing at scale; Maharashtra proved that. The gap is coordination. Property registration in Delhi sits under the Revenue Department, civic identity documents under the e-District framework, and land acquisition for infrastructure under DMRC and DDA separately. Each agency maintains its own image repository with no shared deduplication protocol.

For residents dealing with this now, the most direct route around the problem is to submit photographs in JPEG format at exactly the specifications listed on the Delhi e-District portal — currently 50KB maximum, passport-dimension — and to retain the original file name and metadata rather than renaming or re-saving the image. Duplicate flags are more frequently triggered by files that have been resaved multiple times, creating hash collisions with previously submitted documents. The Revenue Department's Nanakpura helpline — reachable at the numbers listed on the Delhi government's official portal — can also confirm whether a specific file has been flagged before the applicant makes a second trip to the sub-registrar office.